Full-Stack Engineer · React/Next.js · Node · TypeScript · AI products
📍 Dhaka, Bangladesh (UTC+6) · Open to remote · 🌐 salmansadiksiddiquee.tech
~3 years shipping production SaaS:
- 🤖 An AI content platform with 100k+ users: the generation and publishing flows behind 1M+ articles (2B+ words)
- 🏥 A device-lifecycle platform for a European medical-device manufacturer: three portals, EU-MDR-oriented quality management, leading a team of 4 as top contributor
- 📄 A document-AI extraction engine turning scanned utility bills into validated spreadsheets for a North American client: geometric anchors, two-model consensus, 63% of the codebase
- 🏫 A school management system I designed, built, and operate solo in production: 1,000+ students, biometric attendance, guardian SMS
I build LLM features that ship (RAG pipelines, SSE-streaming interfaces, structured outputs) and the integration-heavy systems around them: payments (~$390K processed), HMAC-verified webhooks, cron/queue pipelines, biometric hardware, SMS gateways.
DSA Visualizer: open-source algorithm visualizer
Play/pause/step/scrub playback engine, synchronized pseudocode highlighting, live pointer tracking, and C++/Python/JS/TS code panels. Next.js 16 · Tailwind CSS 4. Live demo →
Brain Booming: live AI writing & utility suite (11 tools)
Gemini structured prompts · Tesseract.js OCR · Auth.js v5 (OAuth + magic links) · MongoDB · Sentry · Vitest. Try it →
School Management System: client work, live in production
ZKTeco biometric attendance with guardian SMS within seconds of a scan, exams and results with auto-computed GPA, Bengali-typography PDF pipelines. React · Node/Express · MongoDB.
Full-Stack Developer · AlgoSoft Technologies · Sep 2025 - present
Device-lifecycle platform for a European medical-device manufacturer (team lead of 4 engineers, top contributor): automated warranty-renewal pipelines (QStash cron), AI support-inbox triage (IMAP + OpenAI), a RAG support chatbot (Upstash Vector, BGE-M3 embeddings, cross-encoder reranking), and a Shopify → platform event broker (Firebase Functions, Cloud Tasks), HMAC-verified, idempotent, and auto-retried.
Full-Stack Developer (Contract) · Simplifai Inc · Jan 2026 - present · Remote (Canada)
Document-AI platform converting scanned utility-bill PDFs into validated Excel rows: a geometric anchor engine, a two-model consensus pipeline whose per-field disagreement drives confidence, and confidence routing that auto-accepts above 0.85 and queues the rest for review. Top contributor at 63% of the codebase. Also the production-hardening pass on a mobile language-learning app: per-user rate limiting, server-side key custody, Sentry, CI, accessibility, and RTL typography.
Frontend React Developer · Affpilot · Oct 2023 - Sep 2025
AI auto-blogging SaaS with 100k+ users: 16 AI article generators behind 1M+ generated articles, write-to-publish pipelines to WordPress/Blogger/Medium/Shopify, checkout and billing across Stripe/PayPal/SSLCommerz/bKash (~$390K processed), and founding frontend engineer (79% of commits) of Flippium, a website-flipping marketplace.
Software Developer (Contract) · H.A.K Academy · Jan 2024 - Aug 2025
Solo-built and operate a school platform for 1,000+ students: 2,000-3,000 biometric punches/day classified in real time, a rate-limited guardian-SMS service with retry/backoff and an emergency kill switch, running on Vercel + DigitalOcean (PM2 cluster).
- Frontend: React 18/19 · Next.js (App Router) · Redux Toolkit / RTK Query · TanStack Query · Tailwind CSS · MUI · shadcn/ui
- Backend: Node.js · Express · REST & GraphQL · Socket.io · cron & queue pipelines (QStash, Cloud Tasks) · JWT/OAuth 2.0 · RBAC
- AI/LLM: OpenAI & Gemini APIs · RAG (vector search, embeddings, reranking) · structured outputs · SSE streaming · multi-model consensus (OpenRouter) · PDF/OCR extraction
- Databases: MongoDB (Mongoose) · PostgreSQL · MySQL (Prisma) · Firestore
- Cloud & Ops: Vercel · DigitalOcean (VPS, PM2) · Firebase/GCP Functions · Google Cloud Vision · GitHub Actions CI · Sentry
- Testing: Vitest · Jest · React Testing Library